If you have enjoyed Echoes+ then you might also enjoy a new FREE game just released on Steam called 1982.
Developed by Binary Zoo, this retro inspired blasta-thon that will test your gaming skills to the max!
http://store.steampowered.com/app/639650/1982/
Like Echoes+, 1982 was created using AppGameKit an easy, quick and powerful game development tool.
http://store.steampowered.com/app/325180/App_Game_Kit_Easy_Game_Development/
TheGameCreators